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March 2009
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Async RS-232 to RS-422 Interface Converter
User Manual
Operates in extended temperatures ranging from -40 to +176° F
(-40 to +80° C).
IC1473A- F-E T
Customer
Support
Information
Order toll-fre e in the U.S.: Call 877- 877-BBOX (outside U.S. call 724-746 -550 0)
FREE technical suppor t 24 hours a day, 7 days a week: Call 724 -746-5500 or fax
724-746-0746 • w ww.blackbox .com • info@ blackbox.com
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Trademarks Used in this Manual
Trademarks Used in this Manual
Black Box and the Double Diamond logo are registered trademarks of
BB Technologies, Inc.
Any other trademarks mentioned in this manual are acknowledged to be
the property of the trademark owners.
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FCC and IC RFI Statements/NOM Statement
FEDERAL COMMUNICATIONS COMMISSION AND
INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio-frequency energy,
and if not installed and used properly, that is, in strict accordance with the
manufacturer’s instructions, may cause inter ference to radio communication.
It has been tested and found to comply with the limits for a Class A computing
device in accordance with the specifications in Subpart B of Part 15 of FCC rules,
which are designed to provide reasonable protection against such interference
when the equipment is operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause interference, in which case
the user at his own expense will be required to take whatever measures may be
necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise
emis sion from digital apparatus set out in the Radio Interference Regulation
of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les
limites applicables aux appareils numériques de la classe A prescrites dans le
Règlement sur le brouillage radioélectrique publié par Industrie Canada.
Normas Oficiales Mexicanas (NOM)
Electrical Safety Statement
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes
de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
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NOM Statement
5. El aparato eléctrico no deberá ser usado cerca del agua — por ejemplo,
cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,
etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio — El usuario no debe intentar dar servicio al equipo eléctrico más allá
lo descrito en las instrucciones de operación. Todo otro servicio deberá ser
referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá,
alfombra o superficie similar puede bloquea la ventilación, no se debe
colocar en libreros o gabinetes que impidan el flujo de aire por los orificios
de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo
del tipo descrito en el instructivo de operación, o como se indique en el
aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la
polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen
del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las
lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.
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NOM Statement
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.
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Async RS-232 to RS-422 Interface Converter User Manual
1. Specifications
Communication RS-422
Data Rate 115.2 kbps max.
Power Port-powered from handshake lines on the RS-232 side,
or 12 to 16 VDC at 40 mA on the terminal blocks.
Dimensions 3.5 x 1.3 x 0.7 in (8.9 x 3.3 x 1.7 cm)
Temperature Rating -40 to +176° F (-40 to +80° C)
2. Introduction
The Async RS-232 to RS-422 Interface Converter is a port-powered two-channel
RS-232 to RS-422 converter that operates in extended temperature environments.
It converts TD and RD RS-232 lines to balanced RS-422 signals. The converter can
be powered from the RS-232 handshake lines, DTR and RTS. If port-powering the
unit, at least one of these handshake lines must be present, but can be in any
state. It can also be powered externally on the terminal blocks. The RS-422 driver
and receiver are always enabled.
To satisfy the requirements of some software packages, the RS-232 handshake
lines are looped back (tied together). RTS is connected to CTS, and DTR is connected to DSR and DCD.
3. Connections
The Async RS-232 to RS-422 Interface Converter is configured to transmit in both
directions between an RS-232 and RS-422 system. The RS-232 side is pinned out
to connect directly into the COM port on your computer or any other DTE device
(Table 3-1). Connections to the RS-422 side of the converter are made through
terminal blocks. When connecting to an RS-422 system, the converter must be
connected with the proper polarity as shown in Figure 3-1. When no data is being
sent and the driver is enabled, the RS-232 line is negative and the RS-422 line
TD(A) is negative with respect to TD(B).
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Async RS-232 to RS-422 Interface Converter User Manual
Table 3-1. RS-232 pinout.
Signal DB9 Female Pin Number
TD 3
RD 2
RTS 7
CTS 8
DTR 4
DSR 6
DCD 1
GND 5
Converter Terminal Block RS-422
TD(A) - ----------------------------------- RD(A) TD(B)+ ---------------------------------- RD(B)+
RD(A) - ----------------------------------- TD(A) RD(B)+ ---------------------------------- TD(B)+
GND ------------------------------------- GND
Figure 3-1. Connection to a RS-422 System.
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Async RS-232 to RS-422 Interface Converter User Manual
4. Biasing Resistors
The biasing resistors for the RS-422/RS-485 receiver are 4.7 k-ohm resistors. These
resistors are labeled R1 and R2 (See Figure 4-1).
Figure 4-1. Biasing resistors diagram.
NOTE: When using an external supply, the supply should be connected only to
specifically labeled power inputs (power jack, terminal block, etc.).
Connecting an external power supply to the handshake lines may damage
the unit. Contact Black Box Technical Support at 724-746-5500 or
[email protected] for more information on connecting an external power
supply to the handshake lines.
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NOTES
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NOTES
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NOTES
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© Copyright 2015. Black Box Corporation. All rights reserved. Black Box® and the Double Diamond logo
are registered trademarks of BB Technologies, Inc. Any third-par ty trademarks appearing in this manual
are acknowledged to be the property of their respective owners.
IC1473A-F-ET, version 1
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